Company Operations and Summary of Significant Accounting Policies - Property, Plant and equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 112,144	$ 109,782
Less: accumulated depreciation and amortization	(59,597)	(60,556)
Total property, plant and equipment, net	52,547	49,226
Equipment, furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	59,736	64,233
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,048	32,074
Instruments available for lease [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,280	12,395
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,080	$ 1,080